拉深简形件水平浮动切边模设计

拉深无凸缘筒形件，由于拉深后筒口边部凸凹不平。采用移动式凸轮，在水平十字形四个方向使凹模浮动与固定的凸模形成相对的剪切刃口，将多余的不平整的边部切掉。每浮动一次切开圆周长的四分之一多一点，共浮动四次。     

汽车C柱左下护板顺序阀热流道倒推注塑模设计

根据汽车C柱左下护板的结构特点,设计了一副大型薄壁顺序阀控制的热流道注塑模具。模具采用动模成型外表面,定模成型内表面的倒推模结构,保证了成型塑件外观要求。模具采用双推杆和辅助杆斜顶侧向抽芯机构,解决了斜顶抽芯面积大、抽芯力大以及倾斜角度大的脱模难题。模具采用“直通式水管+倾斜式水管+隔片式水井”近乎随形水路的温度控制系统,水路布置均匀,模具冷却均衡充分,注射周期缩短了约15 %,成型塑件尺寸精度达到了MT3（GB/T 14486—2008）。     

Volatilization of fluorine in a CaO–SiO2–CaF2-based system with the substitution of Na2O with K2O

Cuspidine-based systems are used to control the crystallization in mold fluxes, which is enabled by CaF₂ additions. However, excess CaF₂ increases the corrosion of casting machines. Therefore, Na₂O and K₂O are added to the mold flux system to ensure an optimized crystallization and lubrication ability of the flux with the CaF₂ content. This study investigated the effect of substituting Na₂O with K₂O on the volatilization of fluorine in a CaO–SiO₂–CaF₂-based slag system at high temperatures. The substitution of Na₂O with K₂O was performed at 5 mol% intervals. The volatilization was observed by thermogravimetric analysis under several isothermal conditions. The mass loss was measured at a heating rate of 5, 10, and 20 K/min. As the temperature increased, the volatilization of the mixed samples increased. The activation energy was calculated using the Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose methods. A kinetic analysis of the volatilization of fluorine was conducted using the calculated parameters and several known kinetic models. Consequently, the volatilization of the Na-rich sample was controlled by chemical reactions and that of the K-rich sample was identified to be controlled by a phase-boundary-controlled reaction. These results suggest that the addition of mixed alkali oxide promote the volatilization during the early stages of the reaction. From the post-experimental composition analyses, the remaining Na and K in the samples suggested a different mechanism for the Na and K volatilization. The volatilization of Na increased with time, whereas K volatilized easily during the beginning of the reaction.     

Effects of particle size distribution and sintering temperature on properties of alumina mold material prepared by stereolithography

Alumina mold materials prepared by stereolithography usually have considerable sintering shrinkage, and their properties related to casting have been rarely studied. In this study, alumina molds materials were prepared by stereolithography, and the effects of particle size distribution and sintering temperature on the properties of the materials were investigated. Results show that the viscosity of the slurries decreases as the fraction of fine powder increases, and the particle size distribution affects the curing behaviors slightly. Sintering shrinkage increases as the fraction of fine powder or the sintering temperature increases. Although lower sintering shrinkage can be achieved by sintering at 1350 °C or 1450 °C, the mold materials sintered at lower temperatures would continue to shrink under the service temperature of 1550 °C, and thus 1550 °C is determined as the optimal sintering temperature. As the fraction of fine powder increases, the creep resistance first increases and then decreases, and specimens prepared with 0.1 fraction of fine powder exhibit the best creep resistance with the droop distance of 4.44 ± 0.45 mm. Specimens prepared with 0.1 fraction of fine powder and sintered at 1550 °C exhibit linear shrinkage of 6.36% along the X/Y direction and 11.39% along the Z direction, and have a flexural strength of 78.15 ± 3.50 MPa and porosity of 30.12 ± 0.08%. The resulting material possesses relatively low sintering shrinkage, proper mechanical strength, porosity and high-temperature properties that meet the requirements for casting purposes.     

水泥净浆流动度影响因素分析及净浆自流淌平台研制

排除水泥和外加剂本身特性、状态因素,水泥净浆流动度还受到测定流动度的玻璃板是否水平、操作者上提截锥圆模速度、浆体和试验玻璃面的浸润性等因素的影响,其中测定流动度的玻璃板是否水平是最主要的客观因素。尤其在净浆中添加一定比例的外加剂,净浆流动性更好,玻璃板面不水平带来的偏差更大。为提高净浆流动性结果准确性、稳定性,我们开发制作了一种自流淌水泥净浆标准平台,设计原理简单,易于调整水平,方便携带。试验完毕可直接在玻璃平面上读数,不仅提高了试验检测结果的重复性、再现性,同时提高了试验效率。     

注射模强行推出机构设计

本文通过对塑料制品在出现侧向凸凹结构时,不采用复杂且模具成本较高的侧向抽芯结构,而是依靠塑料制品所具有的弹性变形特性,利用普通的推出零件使塑料制品强行从注塑模具中完好推出。     

陶瓷吸塑模具制备的工艺研究

本文研究了一种陶瓷吸塑模具，并着重阐述了陶瓷吸塑模具的材料、性能和特点以及该模具在制备过程中工艺路线和工艺要点。     

分油管周向10型芯斜槽抽芯注塑模设计

分析周向带有10个出油孔的分油管的工艺特点，介绍成型该塑料件的注塑模结构及一种特殊的圆周方向10型芯侧向抽芯结构，阐述该模具的工作过程和模具设计与制造中应注意的问题。     

阻尼胶囊的生产工艺研究

通过对胶料配方、工艺规程、模具结构的试验研究，成功地解决了胶囊制造过程中的难点问题。     

双条横稳电磁制动板坯结晶器内钢液流动与传热及凝固耦合的数值模拟

建立了板坯连铸结晶器内流动、传热和凝固耦合的数学模型,分析了在有无电磁制动下,结晶器内钢液流动、温度分布及凝固坯壳厚度的变化情况. 结果表明,在电磁制动的作用下,从浸入式水口流出的钢液速度得到了抑制,引入电磁场能减小射流冲击深度,有利于稳定和减少钢液面波动和促进凝固坯壳的生长,拉速为1.1 m/min时,结晶器出口处凝固坯壳厚度增加约2 mm.